I would love for this to replace the Sonic Blades innate proc or become a whole new AA and be something that has a 25-50% chance to proc when a bard lands a killing shot. I think every class should have their own version of something that happens when they get a killing blow, whether it comes from a tome or AAs.

For Shadowknights - "Deaths Dance" Self, Buff, Song Window, 21s
Effect - Increase all life taps by 15%
Emote - As you kill your foe, you feel the power of death envelope you.
15-20% chance to proc on kill shot